isotope – A package for typesetting isotopes

The pack­age pro­vides a com­mand \iso­tope for set­ting the atomic
weight and atomic num­ber in­di­ca­tions of iso­topes. (The naive way
of do­ing the job with (La)TeX math­e­mat­ics com­mands pro­duces an
un­sat­is­fac­tory re­sult.)